Medium voltage AC collection grid for large scale photovoltaic plants based on medium frequency transformers

Hafez, Bahaa; Krishnamoorthy, Harish S.; Enjeti, P.N.; Borup, U.; Ahmed, Shehab

doi:10.1109/ecce.2014.6954128

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…For almost all the commissioned offshore wind farms, the rated frequency of the offshore AC grid is 50 Hz. Theoretically, the rated frequency of the offshore AC grid could be increased to about 100-400 Hz range [25][26][27][28][29] in the proposed medium frequency DRU based HVDC system, as plotted in Figure 1. However, the exact frequency should be optimized in consideration of the advantages and the side effects by increasing the frequency, such as the investment cost, the operation cost, and the manufacture of the medium frequency equipment.…”

Section: The Proposed Medium Frequency Dru Based Hvdcmentioning

confidence: 99%

“…Further, the applications of the medium frequency AC distribution grid and the DC distribution grid to offshore wind farms were compared in [27], and the results show that the former is superior to the latter in terms of costs and efficiency. Reference [28][29][30] explored the feasibility of adopting the common high-frequency or medium-frequency link to integrate wind energy conversion systems and photovoltaic generation units. A new transmission system structure based on the medium-frequency AC bus and the MMC-HVDC link was shown in [31] to supply deep-sea facilities.…”

Section: Introductionmentioning

confidence: 99%

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Medium frequency diode rectifier unit based HVDC transmission for offshore wind farm integration

Zhang

Tang

2021

IET Renewable Power Gen

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The offshore wind farms are the main trend of the wind power development in the future. The medium frequency diode rectifier unit based high voltage direct current transmission system is proposed here for offshore wind farm integration. Unlike conventional high voltage direct current solutions, the rated frequency of the offshore alternating current (AC) grid is increased to about 100∼400 Hz in the proposed system. Besides, a grid‐forming control scheme for the wind turbine converters is also proposed in this paper, where the machine side converter controls the direct current (DC) voltage and the grid side converter controls its output alternating current voltage in the global unified reference coordinate system. As a result, smaller and lighter passive components, such as the transformers, alternating current filters and reactive power (VAR) compensators, could be adopted in the offshore grid, which is beneficial for achieving higher economic efficiency. The small stability analysis and the time domain simulation of the proposed system are carried out based on a simplified model and power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC) respectively, and the feasibility of the proposed schemes is verified.

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Section: The Proposed Medium Frequency Dru Based Hvdcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Medium frequency diode rectifier unit based HVDC transmission for offshore wind farm integration

Zhang

Tang

2021

IET Renewable Power Gen

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“…Currently, solar PV energy generation transits from the low to the high-power grid system without any challenge [1]. The burgeoning load requirement and the integration of multiple energy sources take place through the course of transmission lines to control the accumulation, and continuity, diminish the supply power bank demands, and replacement of any traditional sources with nonconventional, green, renewable sources [2], [3]. Lamentably, elevation in unbalanced loads is the cause for more predicaments in harmonics power quality in a disseminated system as opposed to the central grid.…”

Section: Introductionmentioning

confidence: 99%

Power quality enhancement of grid-connected PV system

Mishra

Rout

Mishra

et al. 2023

IJPEDS

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<span lang="EN-US">Solar photovoltaic (PV) power, for its multiple benefits, has adhered to prominent consideration in the electrical energy generation region. The double-stage triple-phase grid-connected solar PV (SPV) system is utilized to enhance the power quality by employing a lymphoblastoid cell lines LCL filter. In this method, a DC-DC converter and DC-AC converter make a feasible juncture of the PV systems to the electrical interface. For converting boosted DC into AC, A 3-phase DC-AC converter is used, which is supplied into the grid. A 3-phase voltage converter is employed in place of an inverter for interfacing amid the voltage generated by the PV system and the grid possessing an AC transmission line. An maximum power point tracking (MPPT) application is used in this proposal to amplify the effectiveness of the PV array in face of any unsteady climatic circumstances. Hence, the highest energy could be secured out of the solar PV array and interfaced with the grid. Enhancing power quality by employing an LCL filter is quantified by FFT analysis in MATLAB. The advised proposal has attained a very low total harmonic distortion (THD), proving its efficacy. Also, the outcomes ascertain the applications of the proposed system and extend future advances of renewable energy with a great power quality improvement.</span>

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“…In 2014/Q1 the pre-contracted installation was 2 times the installed [2]. A new structure for utility scale PV farms based on medium frequency transformer concept was introduced in [3]. It was shown that the proposed structure improves the system efficiency, enhance system modularity, reduce system size and installation cost.…”

Section: Introductionmentioning

confidence: 99%

“…The current in all transformers outputs must be equal because the transformers primary windings' are series connected (1). The MF voltage is the sum of all the transformers output (2) and the total power injected to the grid is the power available by each inverter set minus the system losses (3). The fourth constrain is imposed by the cycloconverter buck nature, the MF voltage must be greater than the grid voltage by √ (4).…”

Section: Introductionmentioning

confidence: 99%

A robust controller for medium voltage AC collection grid for large scale Photovoltaic plants based on medium frequency transformers

Hafez

Enjeti

Ahmed

2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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A controller is proposed for a medium voltage medium frequency (MVMF) AC collection grid for utility scale Photovoltaic (PV) farms. A new MVMF AC collection grid was presented in previous work. It enhanced the system modularity, increased the system efficiency and reduced the passive component sizes. The MVMF AC collection grid comprises modules of inverter and medium frequency transformer that are series connected to construct the MF-AC collection grid. An AC/AC cycloconverter is used to interface the MF-AC collection grid to the low frequency utility grid. This paper presented an easy yet robust and fast controller for the proposed MVMF AC collection grid. An 80MW PV power plant located in Eggebek/Germany is used as a design example. The proposed controller is presented in details followed by simulation and hardware results to proof the fast/robust response of the proposed controller. Keywords-Medium voltage medium frequency collection grid, Utility scale PV farms, Medium frequency transformer I.978-1-4673-9550-2/16/$31.00 ©2016 IEEE

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Medium voltage AC collection grid for large scale photovoltaic plants based on medium frequency transformers

Cited by 13 publications

References 13 publications

Medium frequency diode rectifier unit based HVDC transmission for offshore wind farm integration

Medium frequency diode rectifier unit based HVDC transmission for offshore wind farm integration

Power quality enhancement of grid-connected PV system

A robust controller for medium voltage AC collection grid for large scale Photovoltaic plants based on medium frequency transformers

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